diff options
Diffstat (limited to 'm4/dpkg-compiler.m4')
| -rw-r--r-- | m4/dpkg-compiler.m4 | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/m4/dpkg-compiler.m4 b/m4/dpkg-compiler.m4 new file mode 100644 index 0000000..a6192f6 --- /dev/null +++ b/m4/dpkg-compiler.m4 @@ -0,0 +1,251 @@ +# Copyright © 2004 Scott James Remnant <scott@netsplit.com> +# Copyright © 2006, 2009-2011, 2013-2016 Guillem Jover <guillem@debian.org> + +# DPKG_CHECK_COMPILER_FLAG +# ------------------------ +AC_DEFUN([DPKG_CHECK_COMPILER_FLAG], [ + m4_define([dpkg_check_flag], m4_bpatsubst([$1], [^-Wno-], [-W])) + + AC_LANG_CASE( + [C], [ + m4_define([dpkg_compiler], [$CC]) + m4_define([dpkg_varname], [CFLAGS]) + m4_define([dpkg_varname_save], [dpkg_save_CFLAGS]) + m4_define([dpkg_varname_export], [COMPILER_CFLAGS]) + AS_VAR_PUSHDEF([dpkg_varname_cache], [dpkg_cv_cflags_$1]) + ], + [C++], [ + m4_define([dpkg_compiler], [$CXX]) + m4_define([dpkg_varname], [CXXFLAGS]) + m4_define([dpkg_varname_save], [dpkg_save_CXXFLAGS]) + m4_define([dpkg_varname_export], [COMPILER_CXXFLAGS]) + AS_VAR_PUSHDEF([dpkg_varname_cache], [dpkg_cv_cxxflags_$1]) + ]) + AC_CACHE_CHECK([whether ]dpkg_compiler[ accepts $1], [dpkg_varname_cache], [ + AS_VAR_COPY([dpkg_varname_save], [dpkg_varname]) + AS_VAR_SET([dpkg_varname], ["-Werror dpkg_check_flag"]) + AC_COMPILE_IFELSE([ + AC_LANG_SOURCE([[]]) + ], [ + AS_VAR_SET([dpkg_varname_cache], [yes]) + ], [ + AS_VAR_SET([dpkg_varname_cache], [no]) + ]) + AS_VAR_COPY([dpkg_varname], [dpkg_varname_save]) + ]) + AS_VAR_IF([dpkg_varname_cache], [yes], [ + AS_VAR_APPEND([dpkg_varname_export], [" $1"]) + ]) + AS_VAR_POPDEF([dpkg_varname_cache]) +]) + +# DPKG_CHECK_COMPILER_WARNINGS +# ---------------------------- +# Add configure option to disable additional compiler warnings. +AC_DEFUN([DPKG_CHECK_COMPILER_WARNINGS], [ + DPKG_CHECK_COMPILER_FLAG([-Wall]) + DPKG_CHECK_COMPILER_FLAG([-Wextra]) + + DPKG_CHECK_COMPILER_FLAG([-Wcast-align]) + DPKG_CHECK_COMPILER_FLAG([-Wdocumentation]) + DPKG_CHECK_COMPILER_FLAG([-Wduplicated-cond]) + DPKG_CHECK_COMPILER_FLAG([-Wformat -Wformat-security]) + DPKG_CHECK_COMPILER_FLAG([-Winit-self]) + DPKG_CHECK_COMPILER_FLAG([-Wlogical-not-parentheses]) + DPKG_CHECK_COMPILER_FLAG([-Wlogical-op]) + DPKG_CHECK_COMPILER_FLAG([-Wmissing-declarations]) + DPKG_CHECK_COMPILER_FLAG([-Wmissing-format-attribute]) + DPKG_CHECK_COMPILER_FLAG([-Wno-missing-field-initializers]) + DPKG_CHECK_COMPILER_FLAG([-Wno-nonnull-compare]) + DPKG_CHECK_COMPILER_FLAG([-Wno-tautological-constant-out-of-range-compare]) + DPKG_CHECK_COMPILER_FLAG([-Wno-unused-parameter]) + DPKG_CHECK_COMPILER_FLAG([-Wnull-dereference]) + DPKG_CHECK_COMPILER_FLAG([-Wpointer-arith]) + DPKG_CHECK_COMPILER_FLAG([-Wrestrict]) + DPKG_CHECK_COMPILER_FLAG([-Wregister]) + DPKG_CHECK_COMPILER_FLAG([-Wshadow]) + DPKG_CHECK_COMPILER_FLAG([-Wshift-negative-value]) + DPKG_CHECK_COMPILER_FLAG([-Wsizeof-array-argument]) + DPKG_CHECK_COMPILER_FLAG([-Wswitch-bool]) + DPKG_CHECK_COMPILER_FLAG([-Wvla]) + DPKG_CHECK_COMPILER_FLAG([-Wwrite-strings]) + + AC_LANG_CASE( + [C], [ + DPKG_CHECK_COMPILER_FLAG([-Wbad-function-cast]) + DPKG_CHECK_COMPILER_FLAG([-Wc99-c11-compat]) + DPKG_CHECK_COMPILER_FLAG([-Wdeclaration-after-statement]) + DPKG_CHECK_COMPILER_FLAG([-Wmissing-prototypes]) + DPKG_CHECK_COMPILER_FLAG([-Wnested-externs]) + DPKG_CHECK_COMPILER_FLAG([-Wold-style-definition]) + DPKG_CHECK_COMPILER_FLAG([-Wstrict-prototypes]) + ], + [C++], [ + DPKG_CHECK_COMPILER_FLAG([-Wc++11-compat]) + AS_IF([test "x$dpkg_cv_cxx11" = "xyes"], [ + DPKG_CHECK_COMPILER_FLAG([-Wzero-as-null-pointer-constant]) + ]) + ]) +]) + +# DPKG_COMPILER_WARNINGS +# ---------------------- +# Add configure option to disable additional compiler warnings. +AC_DEFUN([DPKG_COMPILER_WARNINGS], [ + AC_ARG_ENABLE([compiler-warnings], + [AS_HELP_STRING([--disable-compiler-warnings], + [Disable (detected) additional compiler warnings])], + [], [enable_compiler_warnings=yes]) + + AS_IF([test "x$enable_compiler_warnings" = "xyes"], [ + DPKG_CHECK_COMPILER_WARNINGS + AC_LANG_PUSH([C++]) + DPKG_CHECK_COMPILER_WARNINGS + AC_LANG_POP([C++]) + + CFLAGS="$COMPILER_CFLAGS $CFLAGS" + CXXFLAGS="$COMPILER_CXXFLAGS $CXXFLAGS" + ]) +]) + +# DPKG_COMPILER_OPTIMIZATIONS +# --------------------------- +# Add configure option to disable optimizations. +AC_DEFUN([DPKG_COMPILER_OPTIMIZATIONS], [ + AC_ARG_ENABLE([compiler-optimizations], + [AS_HELP_STRING([--disable-compiler-optimizations], + [Disable (detected) compiler optimizations])], + [], [enable_compiler_optimizations=yes]) + + AS_IF([test "x$enable_compiler_optimizations" = "xno"], [ + CFLAGS=$(echo "$CFLAGS" | sed -e "s/ -O[[1-9]]*\b/ -O0/g") + ]) +]) + +# DPKG_TRY_C99([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) +# ------------------------------------------------------ +# Try compiling some C99 code to see whether it works +AC_DEFUN([DPKG_TRY_C99], [ + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ +#include <inttypes.h> +#include <stdbool.h> +#include <stdio.h> + +/* Variadic macro arguments. */ +#define variadic_macro(foo, ...) printf(foo, __VA_ARGS__) + ]], [[ + int rc; + + /* Designated initializers. */ + struct { int a, b; } foo = { .a = 1, .b = 2 }; + + /* Compound literals. */ + struct point { int x, y; } p = (struct point){ .x = 0, .y = 1 }; + p = (struct point){ .x = 2, .y = 4 }; + + /* Trailing comma in enum. */ + enum { FIRST, SECOND, } quux; + + /* Boolean type. */ + bool bar = false; + + /* Specific size type. */ + uint32_t baz = 0; + size_t size = SIZE_MAX; + intmax_t imax = INTMAX_MAX; + + /* Format modifiers. */ + rc = printf("%jd", imax); + if (rc == 3) + return 1; + rc = printf("%zu", size); + if (rc == 3) + return 1; + + /* Magic __func__ variable. */ + printf("%s", __func__); + ]]) + ], [$1], [$2])dnl +])# DPKG_TRY_C99 + +# DPKG_C_C99 +# ---------- +# Check whether the compiler can do C99 +AC_DEFUN([DPKG_C_C99], [ + AC_CACHE_CHECK([whether $CC supports C99 features], [dpkg_cv_c99], [ + DPKG_TRY_C99([dpkg_cv_c99=yes], [dpkg_cv_c99=no]) + ]) + AS_IF([test "x$dpkg_cv_c99" != "xyes"], [ + AC_CACHE_CHECK([for $CC option to accept C99 features], [dpkg_cv_c99_arg], [ + dpkg_cv_c99_arg=none + dpkg_save_CC="$CC" + for arg in "-std=gnu99" "-std=c99" "-c99" "-AC99" "-xc99=all" \ + "-qlanglvl=extc99"; do + CC="$dpkg_save_CC $arg" + DPKG_TRY_C99([dpkg_arg_worked=yes], [dpkg_arg_worked=no]) + CC="$dpkg_save_CC" + + AS_IF([test "x$dpkg_arg_worked" = "xyes"], [ + dpkg_cv_c99_arg="$arg" + break + ]) + done + ]) + AS_IF([test "x$dpkg_cv_c99_arg" != "xnone"], [ + CC="$CC $dpkg_cv_c99_arg" + dpkg_cv_c99=1 + ]) + ]) + AS_IF([test "x$dpkg_cv_c99" = "xyes"], [ + AC_DEFINE([HAVE_C99], 1, [Define to 1 if the compiler supports C99.]) + ], [ + AC_MSG_ERROR([unsupported required C99 extensions]) + ]) +])# DPKG_C_C99 + +# DPKG_TRY_CXX11([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) +# -------------- +# Try compiling some C++11 code to see whether it works. +AC_DEFUN([DPKG_TRY_CXX11], [ + AC_LANG_PUSH([C++]) + AC_COMPILE_IFELSE([ + AC_LANG_PROGRAM([[ + ]], [[ + // Null pointer keyword. + void *ptr = nullptr; + ]]) + ], [$1], [$2]) + AC_LANG_POP([C++])dnl +])# DPKG_TRY_CXX11 + +# DPKG_CXX_CXX11 +# -------------- +# Check whether the compiler can do C++11. +AC_DEFUN([DPKG_CXX_CXX11], [ + AC_CACHE_CHECK([whether $CXX supports C++11], [dpkg_cv_cxx11], [ + DPKG_TRY_CXX11([dpkg_cv_cxx11=yes], [dpkg_cv_cxx11=no]) + ]) + AS_IF([test "x$dpkg_cv_cxx11" != "xyes"], [ + AC_CACHE_CHECK([for $CXX option to accept C++11], [dpkg_cv_cxx11_arg], [ + dpkg_cv_cxx11_arg=none + dpkg_save_CXX="$CXX" + for arg in "-std=gnu++11" "-std=c++11"; do + CXX="$dpkg_save_CXX $arg" + DPKG_TRY_CXX11([dpkg_arg_worked=yes], [dpkg_arg_worked=no]) + CXX="$dpkg_save_CXX" + + AS_IF([test "x$dpkg_arg_worked" = "xyes"], [ + dpkg_cv_cxx11_arg="$arg"; break + ]) + done + ]) + AS_IF([test "x$dpkg_cv_cxx11_arg" != "xnone"], [ + CXX="$CXX $dpkg_cv_cxx11_arg" + dpkg_cv_cxx11=yes + ]) + ]) + AS_IF([test "x$dpkg_cv_cxx11" = "xyes"], [ + AC_DEFINE([HAVE_CXX11], 1, [Define to 1 if the compiler supports C++11.]) + ])[]dnl +])# DPKG_CXX_CXX11 |