orm: cross compile pg to linux; openssl: make cross compile work

ROADMAP.md

@@ -43,7 +43,9 @@ For a list of all features and fixes, check out the changelog.
 - [x] Lambdas: `a.sort(|a, b| a > b)`
 - [ ] Custom attributes
 - [ ] Contexts that are passed implicitly (e.g. for custom allocation/memory management)
+- [x] Implicit Veb contexts passed to requests
 - [ ] Direct C/C++ interop without generating wrappers
+- [ ] Make ORM work without installing developer libs (libpq-dev etc)
 
 ## [Version 0.6]
 

vlib/db/pg/pg.c.v

@@ -12,6 +12,7 @@ $if $pkgconfig('libpq') {
 		#flag -lpq
 	}
 	#flag linux -I/usr/include/postgresql
+	//#flag linux -Ipostgresql // cross compiling to linux
 
 	#flag darwin -I/opt/local/include/postgresql11
 	#flag darwin -L/opt/local/lib/postgresql11
@@ -32,12 +33,19 @@ $if $pkgconfig('libpq') {
 	#flag freebsd -L/usr/local/lib
 }
 
-// PostgreSQL Source Code
-// https://doxygen.postgresql.org/libpq-fe_8h.html
-#include <libpq-fe.h>
+$if cross_compile ? && linux {
+	#include <libpq/libpq-fe.h>
+	#include <libpq/pg_config.h>
 
-// for PG_VERSION_NUM, which is defined everywhere at least since PG 9.5
-#include <pg_config.h>
+	//#flag -lpq // libpq.a is located in LINUXROOT/lib/x86_64-linux-gnu/libpq.a
+} $else {
+	// PostgreSQL Source Code
+	// https://doxygen.postgresql.org/libpq-fe_8h.html
+	#include <libpq-fe.h>
+
+	// for PG_VERSION_NUM, which is defined everywhere at least since PG 9.5
+	#include <pg_config.h>
+}
 
 // for orm
 $if windows {

vlib/net/openssl/openssl.c.v

@@ -1,5 +1,7 @@
 module openssl
 
+#define OPENSSL_API_COMPAT 0x30000000L
+
 // On Linux, prefer a locally built openssl, because it is
 // much more likely for it to be newer, than the system
 // openssl from libssl-dev. If there is no local openssl,
@@ -116,6 +118,8 @@ fn C.SSL_set_cipher_list(ctx &SSL, str &char) int
 
 fn C.SSL_get_peer_certificate(ssl &SSL) &C.X509
 
+// fn C.SSL_get1_peer_certificate(ssl &SSL) &C.X509
+
 fn C.X509_free(const_cert &C.X509)
 
 fn C.ERR_clear_error()

vlib/v/cflag/cflags.v

@@ -105,7 +105,9 @@ pub fn (cflags []CFlag) c_options_without_object_files() []string {
 pub fn (cflags []CFlag) c_options_only_object_files() []string {
 	mut args := []string{}
 	for flag in cflags {
-		if flag.value.ends_with('.o') || flag.value.ends_with('.obj') {
+		// TODO figure out a better way to copy cross compiling flags to the linker
+		if flag.value.ends_with('.o') || flag.value.ends_with('.obj')
+			|| (flag.name == '-l' && flag.value == 'pq') {
 			args << flag.format()
 		}
 	}

vlib/v/pref/default.v

@@ -138,6 +138,11 @@ pub fn (mut p Preferences) fill_with_defaults() {
 	}
 	rpath_name := os.file_name(rpath)
 	p.building_v = !p.is_repl && (rpath_name == 'v' || rpath_name == 'vfmt.v')
+	if p.os == .linux {
+		$if !linux {
+			p.parse_define('cross_compile')
+		}
+	}
 	if p.output_cross_c {
 		// avoid linking any GC related code, since the target may not have an usable GC system
 		p.gc_mode = .no_gc