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mattgodbolt-moltymattgodbolt-molty
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Fix gcc 5-10 build issues: Ada MINSIGSTKSZ, ubsan pointer comparison (#40)
* Add patches and config for gcc 5-10 compatibility with modern build env - gcc5/config: disable Ada (was never built with Ada on CE; also ada/init.c uses MINSIGSTKSZ in #if which fails on glibc 2.34+) - gcc6/config: disable Ada (same - not in existing S3 tarballs) - gcc5.1-5.4/patches: wide-int.h template<> fix (applied per-minor so it doesn't try to apply to 5.5.0 which already has the fix) - gcc6.1-6.3/patches: ubsan.c pointer-vs-char comparison fix (xloc.file == '\0' should be xloc.file[0] == '\0'; fixed in 6.4.0) - gcc7-10/patches: ada/init.c MINSIGSTKSZ fix for glibc 2.34+ (MINSIGSTKSZ is no longer a compile-time constant; guard the #if with a __GLIBC_PREREQ check; gcc 11 already removed the check) 🤖 Generated by LLM (Claude, via OpenClaw) * Build Ada for gcc 5 and 6 too (add MINSIGSTKSZ patch) Rather than disabling Ada, apply the same ada/init.c MINSIGSTKSZ patch to gcc5 and gcc6. The patch applies cleanly to both (fuzzy match on line offset). This means all rebuilt compilers will include Ada support. 🤖 Generated by LLM (Claude, via OpenClaw) * Use symlinks for wide-int patch in gcc5.2-5.4 (not copies) 🤖 Generated by LLM (Claude, via OpenClaw) * Move patches to top level, use symlinks from version dirs Canonical patch files live at build/patches/*.patch; version-specific dirs contain symlinks, making the intent clear. Consistent with the existing binutils-in-tree.patch pattern. 🤖 Generated by LLM (Claude, via OpenClaw) --------- Co-authored-by: mattgodbolt-molty <mattgodbolt-molty@users.noreply.github.com>
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‎build/patches/ada-minsigstksz.patch‎

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--- a/gcc/ada/init.c 2026-03-10 13:21:47.767280667 -0500
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+++ b/gcc/ada/init.c 2026-03-10 13:21:47.792659877 -0500
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@@ -572,9 +572,13 @@
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#define HAVE_GNAT_ALTERNATE_STACK 1
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/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size.
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It must be larger than MINSIGSTKSZ and hopefully near 2 * SIGSTKSZ. */
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+/* On glibc 2.34+, MINSIGSTKSZ is not a compile-time constant.
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+ Skip this check on those systems. */
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+#if !defined (__GLIBC__) || !__GLIBC_PREREQ (2, 34)
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# if 16 * 1024 < MINSIGSTKSZ
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# error "__gnat_alternate_stack too small"
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# endif
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+#endif
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char __gnat_alternate_stack[16 * 1024];
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#endif
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‎build/patches/gcc10/ada-minsigstksz.patch‎

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../ada-minsigstksz.patch

‎build/patches/gcc5.1/wide-int-modern-cxx.patch‎

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../wide-int-modern-cxx.patch

‎build/patches/gcc5.2/wide-int-modern-cxx.patch‎

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../wide-int-modern-cxx.patch

‎build/patches/gcc5.3/wide-int-modern-cxx.patch‎

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../wide-int-modern-cxx.patch

‎build/patches/gcc5.4/wide-int-modern-cxx.patch‎

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../wide-int-modern-cxx.patch

‎build/patches/gcc5/ada-minsigstksz.patch‎

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../ada-minsigstksz.patch

‎build/patches/gcc6.1/ubsan-ptr-cmp.patch‎

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../ubsan-ptr-cmp.patch

‎build/patches/gcc6.2/ubsan-ptr-cmp.patch‎

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../ubsan-ptr-cmp.patch

‎build/patches/gcc6.3/ubsan-ptr-cmp.patch‎

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../ubsan-ptr-cmp.patch

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