Bug#1071151: ghc: Use extra --ghc-options in d/rules on loong64

[Peng Fan]

Package: ghc
Version: 9.4.7-1+loong64.1
Severity: important
Tags: ftbfs patch
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

Compiling the haskell-pandoc failed for loong64 in the Debian Package
Auto-Building environment.
The error log is as follows,
```
[58 of 58] Linking dist-ghc/build/test-pandoc/test-pandoc
/usr/bin/ld.bfd:
/usr/lib/ghc/lib/../lib/loongarch64-linux-ghc-9.4.7/rts-1.0.2/libHSrts-1.0.2_thr.a(NonMovingMark.thr_o):
relocation R_LARCH_B26 overflow 0xfffffffff5fec6a4
Dump relocate record:
stack top        relocation name        symbol
at
/usr/lib/gcc/loongarch64-linux-gnu/13/../../../loongarch64-linux-gnu/crt1.o(.text+0x0):
...
0x0000000000000000 R_LARCH_NONE    `<nameless>' + 3(0x3)
......

```

The Full log can be found at
https://buildd.debian.org/status/logs.php?pkg=haskell-pandoc&ver=3.1.3-1&arch=loong64.

The reason for the above error is that "relocation R_LARCH_B26 overflow
......" occurs during static linking in the test-pandoc stage.
Currently we have a verified method, don't need to skip test cases to solve "relocation R_LARCH_B26
overflow ......" during static linking.
The verified method is as follows,
We need to add extra --ghc-options in d/rules on loong64 to increase jump-instructions's range.

```
diff --git a/debian/rules b/debian/rules
index 29b9da7..4c55f52 100755
--- a/debian/rules
+++ b/debian/rules
@@ -102,6 +102,10 @@ ifneq (,$(filter noopt, $(DEB_BUILD_OPTIONS)))
   EXTRA_HADRIAN_FLAGS += "*.*.rts.*.opts += -O0"
 endif

+ifneq (,$(filter loong64, $(DEB_HOST_ARCH)))
+  EXTRA_HADRIAN_FLAGS += "*.*.ghc.*.opts += -optc-mcmodel=medium"
+endif
+
 ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
   NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
 endif
```

Meanwhile, you can also consider the patch I attached.
Your opinions are welcome.

Thanks.



-- System Information:
Debian Release: trixie/sid
  APT prefers unreleased
  APT policy: (500, 'unreleased'), (500, 'unstable')
Architecture: loong64 (loongarch64)

Kernel: Linux 5.10.0-60.121.0.148.oe2203.loongarch64 (SMP w/32 CPU threads)
Kernel taint flags: TAINT_UNSIGNED_MODULE
Locale: LANG=zh_CN.UTF-8, LC_CTYPE=zh_CN.UTF-8 (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to POSIX), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect

Versions of packages ghc depends on:
ii  dpkg            1.22.6
ii  gcc             4:13.2.0-7
ii  libbsd-dev      0.12.2-1
ii  libc6           2.38-11
ii  libc6-dev       2.38-11
ii  libffi-dev      3.4.6-1
ii  libffi8         3.4.6-1
ii  libgmp-dev      2:6.3.0+dfsg-2
ii  libgmp10        2:6.3.0+dfsg-2
ii  libncurses-dev  6.5-2
ii  libnuma1        2.0.18-1
ii  libtinfo6       6.5-2
ii  llvm-16         1:16.0.6-27

ghc recommends no packages.

Versions of packages ghc suggests:
ii  ghc-doc   9.4.7-5
ii  ghc-prof  9.4.7-1+loong64.1
pn  llvm-15   <none>
ii  perl      5.38.2-4

-- no debconf information
-------------- next part --------------
diff --git a/debian/rules b/debian/rules
index 29b9da7..4c55f52 100755
--- a/debian/rules
+++ b/debian/rules
@@ -102,6 +102,10 @@ ifneq (,$(filter noopt, $(DEB_BUILD_OPTIONS)))
   EXTRA_HADRIAN_FLAGS += "*.*.rts.*.opts += -O0"
 endif
 
+ifneq (,$(filter loong64, $(DEB_HOST_ARCH)))
+  EXTRA_HADRIAN_FLAGS += "*.*.ghc.*.opts += -optc-mcmodel=medium"
+endif
+
 ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
   NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
 endif