From fa37928536e0048a262260baf998ead026b14bb9 Mon Sep 17 00:00:00 2001
From: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>
Date: Wed, 14 Jan 2026 13:07:37 +0100
Subject: [PATCH] build: Temporarily remove confusing and brittle
 -fdebug-prefix-map

---
 CMakeLists.txt                | 5 ++---
 contrib/guix/libexec/build.sh | 1 +
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1b1df77b019..eb27f9894f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -488,9 +488,8 @@ try_append_cxx_flags("-fno-extended-identifiers" TARGET core_interface SKIP_LINK
 # which can cause issues with coverage builds, particularly when using
 # Clang in the OSS-Fuzz environment due to its use of other options
 # and a third party script, or with GCC.
-try_append_cxx_flags("-fdebug-prefix-map=A=B" TARGET core_interface SKIP_LINK
-  IF_CHECK_PASSED "-fdebug-prefix-map=${PROJECT_SOURCE_DIR}/src=."
-)
+# Set `-fmacro-prefix-map`, so that source file names are expanded without the
+# src prefix.
 try_append_cxx_flags("-fmacro-prefix-map=A=B" TARGET core_interface SKIP_LINK
   IF_CHECK_PASSED "-fmacro-prefix-map=${PROJECT_SOURCE_DIR}/src=."
 )
diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index f4db25f4f90..1eaa86aeb3e 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -211,6 +211,7 @@ CONFIGFLAGS="-DREDUCE_EXPORTS=ON -DBUILD_BENCH=OFF -DBUILD_GUI_TESTS=OFF -DBUILD
 # CFLAGS
 HOST_CFLAGS="-O2 -g"
 HOST_CFLAGS+=$(find /gnu/store -maxdepth 1 -mindepth 1 -type d -exec echo -n " -ffile-prefix-map={}=/usr" \;)
+HOST_CFLAGS+=" -fdebug-prefix-map=${DISTSRC}/src=."
 case "$HOST" in
     *mingw*)  HOST_CFLAGS+=" -fno-ident" ;;
     *darwin*) unset HOST_CFLAGS ;;