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Fix cross-compilation for musl C library

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This adds a PHP_C_STANDARD_LIBRARY Autoconf macro to detect glibc/musl
more accurately and fixes "cross-compilation" with musl-libc on glibc
systems.

Co-authored-by: Peter Kokot <peterkokot@gmail.com>

Closes GH-19352
This commit is contained in:
DubbleClick
2025-10-02 10:50:58 +02:00
committed by Peter Kokot
parent 1a44cd6557
commit 2b8d8ba7c4
4 changed files with 48 additions and 10 deletions
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40
build/php.m4
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@@ -2502,3 +2502,43 @@ AC_DEFUN([PHP_REMOVE_OPTIMIZATION_FLAGS], [
CFLAGS=$(echo "$CFLAGS" | $SED -e "$sed_script")
CXXFLAGS=$(echo "$CXXFLAGS" | $SED -e "$sed_script")
])
dnl
dnl PHP_C_STANDARD_LIBRARY
dnl
dnl Determine the C standard library used for the build. The uclibc is checked
dnl first because it also defines the __GLIBC__ and could otherwise be detected
dnl as glibc. Musl C library is determined heuristically.
dnl
AC_DEFUN([PHP_C_STANDARD_LIBRARY],
[AC_CACHE_CHECK([C standard library implementation],
[php_cv_c_standard_library],
[php_cv_c_standard_library=unknown
dnl Check if C standard library is uclibc.
AS_VAR_IF([php_cv_c_standard_library], [unknown],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <features.h>],
[#ifndef __UCLIBC__
(void) __UCLIBC__;
#endif])],
[php_cv_c_standard_library=uclibc],
[php_cv_c_standard_library=unknown])])
dnl Check if C standard library is GNU C.
AS_VAR_IF([php_cv_c_standard_library], [unknown],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <features.h>],
[#ifndef __GLIBC__
(void) __GLIBC__;
#endif])],
[php_cv_c_standard_library=glibc],
[php_cv_c_standard_library=unknown])])
dnl Check if C standard library is musl libc.
AS_VAR_IF([php_cv_c_standard_library], [unknown],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdarg.h>],
[#ifndef __DEFINED_va_list
(void) __DEFINED_va_list;
#endif])],
[php_cv_c_standard_library=musl],
[AS_IF([command -v ldd >/dev/null && ldd --version 2>&1 | grep ^musl >/dev/null 2>&1],
[php_cv_c_standard_library=musl],
[php_cv_c_standard_library=unknown])])])
])
])